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Welcome to AX84® the base camp for tube (valve) electronics hobbyists.

AX84 exists to provide:

1) A great environment to learn about music-related electronics in general. AX84 is a place where those with experience are interested in helping diligent beginners who are willing to do their homework.

2) A place where those with more experience can field their ideas to peers and get useful feedback.

3) An environment that respects the past, but is not enslaved by it. INNOVATION IS GOOD (and it didn't die in the 1950s.) There are new things under the sun every day. Move the ball forward!

Our HUGE discussion area is under 'Discussion Forum' to your left.

We are hard at work improving the site- check back often!

Recent Forum Threads
"12v heaters again..."
Posted By Darren Porter on 09/27/2016
So if I absolutely needed to run 12V DC heaters, do you think this would be a good easy solution for a well-filtered supply? Or would I not want a switching supply? They are only $14.86 at DigiKey for...

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"Pdiss, power transfer and overdrive"
Posted By Joncaster on 09/27/2016
Hey guys,

Ive only seen a tiny mention of this, and wanted to check if I understand this correctly:

In a Single Ended power section, the idle dissipation is the max Plate dissipation as thermal ...

Discuss this entry
"Problem with my abbrevieted version of Bkackface"
Posted By AndRed on 09/26/2016
Hi there!
It's been a lot of time that I don't write nothing on this forum!
But today I had something on my new amp that is very weird!
I've built a revisited version of a Blackface AB763: basicall...

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"Amps sweet spot too quiet"
Posted By Audiosalvage on 09/26/2016
I've been having ongoing distortion feel issues with my jcm 800 clone and finally got my plate voltases in spec (422v). I thought the amp would behave differently but the same problem remains, and th...

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"transformer weight"
Posted By Denny Allen on 09/26/2016
I am going to ask a lot of questions before this forum goes away. I have a rule of thumb to figure the wattage rating of unknown 60hz transformers. I weigh them and figure they are good for 20 watts...

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Updates: Tue, Sep 27th, 2016 @ 18:46:53
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Site News

2014-10-21: Be sure to check out our discussion forum using the link on the left..

2014-10-20: The Treasure Fleet is on the way to Rio De La Hacha with a fortune in gold!

We're looking for media clips of recent builds... please stop by the forum and respond to the thread.

2008-10-4: Archived Projects section is functional again.

2008-9-18: RSS Feeds for the forum have been up for a while, but not advertised...
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2008-6-26: Want to participate in our discussion forums? You are welcome to read and lurk as you like. If you think you'd like to post with regularity, please sign up for an account.

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